I feel indifferent all the time, what's wrong with me?

I am a teenager, so I thought it might be teen angst, but I'm not really sure what that is.I don't care about anything. And I don't really have much feeling. I do 'feel' occasionally, but whenever I do, it's not really a deep kind of feeling. Now whenever I make decisions, I keep logic in mind instead of heart. I'm not sad, just indifferent. I think it's not a good thing to feel like this because devotion to anything requires feeling. I finally have my first boyfriend now, so I thought that I might actually get feelings back, but I was wrong. I don't care for him at all. I don't even care for my friends. I try to make friends because I think it's important to have them once I gain back feeling (I plan to) But I don't really want feeling back, because there are often several times a day when I say to myself, "It's a good thing I don't care or have much feeling." Then I am glad I don't have feeling because that destroys all the feelings that are undesirable.